vmm: setup hosts, hostname and resolv.conf files #756

Job	Run time
tests (vmm/sandbox, --all-features)	2m 56s
tests (vmm/task, --all-features)	2m 41s
checks (vmm/sandbox, --all-features)	1m 19s
tests (shim, --all-features)	2m 37s
checks (vmm/task, --all-features)	1m 2s
checks (shim, --all-features)	1m 6s
tests (quark, --all-features)	2m 27s
checks (quark, --all-features)	1m 19s
tests (runc, --all-features)	2m 43s
checks (runc, --all-features)	1m 11s
tests (wasm, --features=wasmedge, 0.11.2)	2m 41s
checks (wasm, --features=wasmedge, 0.11.2)	1m 16s
checks (wasm, --features=wasmtime)	1m 19s
tests (wasm, --features=wasmtime)	2m 58s
	27m 35s

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